Generic setup issues
"Windows cannot access the specified device, path, or file" error when you try to install, update or start a program or file
This is very likely an issue in your Windows environment. Please have a look at the Microsoft MSDN help for this question:
I'm not able to uninstall because of a missing MSI file/dependency
Such problems happen if Windows is having a corrupted installer configuration, independently of regify. As this is a common problem on Windows, Microsoft offers a tool to solve such issues. Please try to solve the issue with this tool.
As this is a Windows issue and not directly related to regify, we sadly can not give further assistance. Google for "uninstall missing msi file" will give you a lot of possible solutions and tools to solve such issues, too.
You also may try to activate MSI debugging for further investigation.
Setup starts while I'm simply trying to use regify
At first, the mechanism of Microsoft Windows tries to re-run the setup (MSI, Installer) automatically, if files or registry keys (created by the setup) have changed or are missing. Thus, please check your AntiVirus log files if some components of regify have been classified as dangerous (false alert). If AV software, or other software setups, removed or downgraded components of regify, this may happen.
In some case, a complete uninstall followed by a fresh install of the most recent setup fixed the issues. As this is a Windows issue and not directly related to regify, we sadly can not give you any further assistance on this.
If you're an IT professional and if you're able reproduce the problem, you may activate MSI debugging to identify the missing component.